Line-to-line voltage is defined as the voltage between which elements?

Line-to-line voltage is defined as the voltage between which elements?

• A. The voltage between any two lines
• B. The voltage between line and neutral
• C. The total power of the system
• D. The voltage across the generator's rotor

Answer: (A)

Line-to-line voltage is the potential difference between two different lines (phases) in a three-phase system. It’s the voltage you’d measure with a voltmeter connected across any two lines, which is what powers equipment that connects line-to-line. In a balanced wye system, this line-to-line voltage is sqrt(3) times the line-to-neutral (phase) voltage, so for example, 120 V line-to-neutral gives about 208 V line-to-line. This helps distinguish it from line-to-neutral, which is the voltage between a line and the neutral conductor, and from other concepts like total system power or rotor voltage.

Line-to-line voltage is the potential difference between two different lines (phases) in a three-phase system. It’s the voltage you’d measure with a voltmeter connected across any two lines, which is what powers equipment that connects line-to-line.

In a balanced wye system, this line-to-line voltage is sqrt(3) times the line-to-neutral (phase) voltage, so for example, 120 V line-to-neutral gives about 208 V line-to-line. This helps distinguish it from line-to-neutral, which is the voltage between a line and the neutral conductor, and from other concepts like total system power or rotor voltage.